@misc{indiciae9dd67806bd8d,
  title = {Topographic maps},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1975},
  doi = {10.3133/70039400},
  url = {https://pubs.usgs.gov/publication/70039400},
  note = {Source identifier: 70039400}
}